here it (finally) is! the M4A1 S-System. full credits to legogunsarchive and jack streat.

About this creation

FULL CREDITS TO JACK STREAT FOR THE MECHANISM
FULL CREDITS TO LEGOGUNSARCHIVE FOR THE WALLS
FULL CREDITS TO FPSUSERNAME FOR THE CARRYHANDLE
FULL CREDITS TO XUBOR2000 FOR THE REFLEX

I have not much to say about this gun, it is actually jack streats HK 416 but with different walls. you can visit his page to find more details.

this gun features:

- full black (even the internals)
- working reflex sight
- working carryhandle (but you still have to be carefull)
- 8 meters range
- can be made very powerfull if you use 7 rubber bands (you only have to change the hammer onec or twice a day)

the pictures are pretty self-explaining

this are not the best pictures, i know, but i don't have better now
next is the l96a1